You can also use Mercedes Benz and Audi wheels which have the same bolt pattern, however, watch your offset (the "ET" number, which means how far the rim is pushed in from the plane of the mounting surface). If the offset is too big, you'll need spacers. If the ET is too small, the wheels will stick out of the wheelwells.
Also, some rims use differently-shaped lug nuts, or have a different nut seating area.
WHat is the ET of your stock rims?
There's loads of MB & Audi rims on Ebay, both OEM and aftermarket, in every imaginable size... I'm considering some Merc S500 16" rims for my Vanagon Syncro, I love the 8-spoke version.